摘要
为描述与认识油藏大孔道的形成与演化规律,建立了一套流固耦合数学模型。该数学模型由储集层渗透率演化模型与油藏流体渗流方程耦合而成,其中储集层渗透率的变化模型为渗透率与累计线流量的关系方程,反映了大孔道的演化过程。在此基础上,开发了模型求解软件。通过对正韵律概念模型的模拟计算,得出了大孔道在地层中的形成与演化规律:随着含水率的增加大孔道逐渐发育,含水率越高,大孔道越明显;大孔道主要发育在近井地带和主流线上;大孔道在正韵律厚油层底部发育;渗透率级差越大,注水过程中越容易形成大孔道;注采不均衡性导致在注采强度较大的方向上容易形成大孔道。实际模拟了胜利孤岛油田中二中30NB20井区Ng35大孔道的形成过程和特征,相应注水井实施调剖措施的效果进一步证实了大孔道的存在及本方法的可靠性。
A fluid-solid coupling mathematical model is established to describe the evolution of high-permeability channels. The model consists of the dynamic evolving model of permeability and the fluid flow equation. The dynamic evolving model of permeability, indicating the relationship of cumulative liner flow rate and permeability, reflects the evolution process of high-permeability channels. On this basis, corresponding solution software was developed. Through simulation and calculation of a positive rhythm conceptual model, conclusions are as follows： high-permeability channels gradually develop with the increase of water cut; high permeability channels exist mainly in areas close to well bores and along the main stream lines, and develop at the bottom of positive rhythm reservoir; high-permeability channels can develop more easily if permeability differential increases; the unbalance between injection and production leads to the development of high permeability channels. The developing process and characteristics of high-permeability channels were simulated practically for Ng3^5 channels in well site 30NB20 in Gudao Oilfield, Shengli, and the effect of profile control on the corresponding injection wells testified the existence of high-permeability channels and also the reliability of this method.
出处
《石油勘探与开发》
SCIE
EI
CAS
CSCD
北大核心
2009年第4期498-502,512,共6页
Petroleum Exploration and Development
基金
国家863项目(2007AA06Z00)
山东省泰山学者建设工程项目(ts20070704)
关键词
大孔道
渗透率演化模型
渗流方程
流固耦合
数值模拟
high-permeability channel~ permeability evolving model
flow equation
fluid-solid coupling
numerical simulation
